INVESTMENT SECURITIES - AFS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2008
Securities available for sale:
Amortized Cost	$ 461,792	$ 479,825
Gross Unrealized Gains	4,188	4,310
Gross Unrealized Losses	(1,455)	(2,860)
Fair Value	464,525	481,275
U.S. Treasury securities and U.S. Government agencies
Securities available for sale:
Amortized Cost	270,360	295,425
Gross Unrealized Gains	37	226
Gross Unrealized Losses	(812)	(1,107)
Fair Value	269,585	294,544
Private label mortgage backed security
Securities available for sale:
Amortized Cost	3,300	3,691
Gross Unrealized Gains	1,240	1,086
Fair Value	4,540	4,777
Mortgage backed securities - residential
Securities available for sale:
Amortized Cost	88,776	71,197
Gross Unrealized Gains	1,892	2,027
Gross Unrealized Losses	(213)	(220)
Fair Value	90,455	73,004
Collateralized mortgage obligations
Securities available for sale:
Amortized Cost	78,382	88,559
Gross Unrealized Gains	409	334
Gross Unrealized Losses	(387)	(1,239)
Fair Value	78,404	87,654
Freddie Mac preferred stock
Securities available for sale:
Gross Unrealized Gains	337	483
Fair Value	337	483	$ 0
Community Reinvestment Act mutual fund
Securities available for sale:
Amortized Cost	2,500	2,500
Gross Unrealized Gains	4
Gross Unrealized Losses	(25)	(45)
Fair Value	2,479	2,455
Corporate bonds
Securities available for sale:
Amortized Cost	15,003	15,004
Gross Unrealized Gains	269	154
Fair Value	15,272	15,158
Trust preferred security
Securities available for sale:
Amortized Cost	3,471	3,449
Gross Unrealized Losses	(18)	(249)
Fair Value	$ 3,453	$ 3,200

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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